Earlier, I had been looking for where Burton Rascoe's review of Lo! was published, noting that the citations in the biographies of Fort do not support what the text says.
It turns out that, despite the confusing citations, Steinmeyer was right: Rascoe's review appeared in The New York Herald Tribune. To be specific, it appeared on page 5 of the February 15 issue and was about 1200 words long.
I still haven't seen the review itself, though. This information comes from The Book Review Digest of 1931.